【填空题】计算:d(cosx)=_____dx,d(lnx)=_____dx,d(sin3x)=________dx
举一反三
- d(2x)=( )dx,d(sin x)=( )dx(1/x)dx=d( );cosdx=d( )
- 下列凑微分公式正确的是 A: ∫f(cosx)sinxdx=∫f(cosx)dcosx B: ∫f(cosx)sinxdx=-∫f(cosx)dcosx C: ∫f(x³)x²dx=½∫f(x³)dx³ D: ∫f(x²)xdx=½∫f(x²)dx²
- 8. 下列不等式正确的是 A: $0\lt \int_{0}^{\frac{\pi }{2}}{\sin (\sin x)dx}\lt \int_{0}^{\frac{\pi }{2}}{\cos (\sin x)dx}$ B: $0\lt \int_{0}^{\frac{\pi }{2}}{\cos (\sin x)dx}\lt \int_{0}^{\frac{\pi }{2}}{\sin (\sin x)dx}$ C: $\int_{0}^{\frac{\pi }{2}}{\sin (\sin x)dx}\lt 0\lt \int_{0}^{\frac{\pi }{2}}{\cos (\sin x)dx}$ D: $\int_{0}^{\frac{\pi }{2}}{\cos (\sin x)dx}\lt 0\lt \int_{0}^{\frac{\pi }{2}}{\sin (\sin x)dx}$
- d(sin3x)=cos3x dx
- 设y=cos(x-3)则dy=______． A: sin(x-3)dx B: cos(x-3)dx C: -sin(x-3)dx D: -cos(x-3)dx